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I wonder if you aren't running afoul of some PHP configuration (e.g. proxy configuration) or perhaps SELinux policies.

Regards,Alec SmecherPublic Knowledge Project Team

The PHP directive allow_url_fopen is set "On" as default. SELinux is not installed, because Debian doesn't come with it. Proxy is also ok.

We have another Linux web server at chapim.furb.br and if we use "telnet pkp.sfu.ca 80" and a "GET /ojs/xml/ojs-version.xml" the file comes normally. But if we do the same at gorila.furb.br the "GET" freezes and no answer comes.

Hmm, we have no blocks on this side; are the two machines (chapim.furb.br and gorila.furb.br) on the same internal network? If so, that suggests to me that there is something internal to your network that is causing one machine not to be able to access the descriptor but not the other.